BAEL-4572: Add List#copyOf and Set#copyOf (#9903)

* BAEL-4572: Move Converting Between a List and a Set in Java to core-java-10

* BAEL-4572: Add Java10 examples

core-java-modules/core-java-10/README.md

@@ -9,3 +9,4 @@ This module contains articles about Java 10 core features
 - [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
 - [Deep Dive Into the New Java JIT Compiler – Graal](https://www.baeldung.com/graal-java-jit-compiler)
 - [Copying Sets in Java](https://www.baeldung.com/java-copy-sets)
+- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)

core-java-modules/core-java-10/pom.xml

@@ -1,22 +1,29 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project
-    xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>core-java-10</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-10</name>
     <packaging>jar</packaging>
-    <url>http://maven.apache.org</url>
 
     <parent>
-        <groupId>com.baeldung</groupId>
+        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>core-java-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../</relativePath>
+        <relativePath>../</relativePath>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>
@@ -34,6 +41,7 @@
     <properties>
         <maven.compiler.source.version>10</maven.compiler.source.version>
         <maven.compiler.target.version>10</maven.compiler.target.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
     </properties>
 
 </project>

core-java-modules/core-java-10/src/test/java/com/baeldung/java10/collections/conversion/ListSetConversionUnitTest.java

@@ -0,0 +1,68 @@
+package com.baeldung.java10.collections.conversion;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.apache.commons.collections4.CollectionUtils;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public class ListSetConversionUnitTest {
+
+    // Set -> List; List -> Set
+
+    @Test
+    public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = new ArrayList<>(sourceSet);
+    }
+
+    @Test
+    public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = new HashSet<>(sourceList);
+    }
+
+    @Test
+    public void givenUsingJava10_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = List.copyOf(sourceSet);
+    }
+
+    @Test
+    public void givenUsingJava10_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = Set.copyOf(sourceList);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = Lists.newArrayList(sourceSet);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = Sets.newHashSet(sourceList);
+    }
+
+    @Test
+    public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+
+        final Set<Integer> targetSet = new HashSet<>(6);
+        CollectionUtils.addAll(targetSet, sourceList);
+    }
+
+    @Test
+    public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+
+        final List<Integer> targetList = new ArrayList<>(6);
+        CollectionUtils.addAll(targetList, sourceSet);
+    }
+}

java-collections-conversions/README.md

@@ -5,7 +5,6 @@ This module contains articles about conversions among Collection types and array
 ### Relevant Articles: 
 - [Converting between an Array and a List in Java](https://www.baeldung.com/convert-array-to-list-and-list-to-array)
 - [Converting between an Array and a Set in Java](https://www.baeldung.com/convert-array-to-set-and-set-to-array)
-- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)
 - [Convert a Map to an Array, List or Set in Java](https://www.baeldung.com/convert-map-values-to-array-list-set)
 - [Converting a List to String in Java](https://www.baeldung.com/java-list-to-string)
 - [How to Convert List to Map in Java](https://www.baeldung.com/java-list-to-map)

java-collections-conversions/src/test/java/com/baeldung/java/collections/JavaCollectionConversionUnitTest.java

@@ -101,42 +101,6 @@ public class JavaCollectionConversionUnitTest {
         final int[] primitiveTargetArray = ArrayUtils.toPrimitive(targetArray);
     }
 
-    // Set -> List; List -> Set
-
-    public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
-        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
-        final List<Integer> targetList = new ArrayList<>(sourceSet);
-    }
-
-    public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
-        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
-        final Set<Integer> targetSet = new HashSet<>(sourceList);
-    }
-
-    public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
-        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
-        final List<Integer> targetList = Lists.newArrayList(sourceSet);
-    }
-
-    public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
-        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
-        final Set<Integer> targetSet = Sets.newHashSet(sourceList);
-    }
-
-    public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
-        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
-
-        final Set<Integer> targetSet = new HashSet<>(6);
-        CollectionUtils.addAll(targetSet, sourceList);
-    }
-
-    public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
-        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
-
-        final List<Integer> targetList = new ArrayList<>(6);
-        CollectionUtils.addAll(targetList, sourceSet);
-    }
-
     // Map (values) -> Array, List, Set
 
     @Test